For iOS and iPadOS (iPhone and iPad), there is an app that will have a direct search of open access databases and also include a browser extension. The included browser extension is what is most useful.
Once you've set everything up, you won't need to open the app itself. You can just use the extension within the Safari web browser.
Steps:
- Download the iOS/iPadOS app.
- Follow these instructions for extension settings.
- Click on the Open Access Helper icon in Safari and select "settings" or click the gear icon.

- Follow the main Open Access Helper settings directions in this guide.